Process for the separation of waste products of the food industry

A process for separately recovering or converting for reuse the fats, sugar, protein and starch from wastes occurring in the making of bakery products and containing these components,

• the said process comprising
• 1. subjecting the comminuted waste product to a first extraction filtration with a liquid fat solvent, removing the filtered-out fat solution, recovering the fat and recycling the solvent;
• 2. then subjecting the degreased product to a second extraction-filtration step in the same extraction-filtration zone with an aqueous or alcoholic sugar solvent, followed by removing the filtered-out sugar solution from said suspension and recovering the sugar therefrom;
• and
• 3. thereafter withdrawing the filter residue from said extraction-filtration zone and subjecting it to an acidic or enzymatic hydrolysis and aerobic fermentation with a yeast, subjecting the product to purification and concentration and then drying the concentrate so as to recover a solids product in the form of crude protein and yeast for reuse in food products.